Case 3 - Torn Letter
Scroll down for more clues and the answer.
Once you have pieced together the letter, look at some of the words, are any of them standing out more than others? Not only does the letter rule out a venue but it also reveals a 3 digit code.
There are 3 words in bold. These are the colours Blue, Red and Black. Is there anything on the desk that could help give these colours a number?
Using the billiard balls on the desk take the number value for each colour,
blue = 2 red = 3 black = 8
Add this number 238 to the number you revealed from the Cocktail Chemical Analysis to open a lock.